Monolayered MoSe2: a candidate for room temperature polaritonics
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Monolayered MoSe2 is a promising new material to investigate advanced light-matter coupling as it hosts stable and robust excitons with comparably narrow optical resonances. In this work, we investigate the evolution of the lowest lying excitonic transition, the so-called A-valley exciton, with temperature. We find a strong, phonon-induced temperature broadening of the resonance, and more importantly, a reduction of the oscillator strength for increased temperatures, which we describe in the framework of a microscopic model. Based on these experimentally extracted, temperature dependent parameters, we apply a coupled oscillator model to elucidate the possibility to observe the strong coupling regime between the A-exciton and a microcavity resonance in three prototypical photonic architectures with varying mode volumes. We find that the formation of exciton-polaritons up to ambient conditions in compact, monolithic dielectric and Tamm-based structures seems feasible. In contrast, a temperature-induced transition into the weak coupling regime can be expected for structures with extended effective cavity length. Based on these findings, we calculate and draw the phase diagram of polariton Bosonic condensation in a microcavity with embedded MoSe2 monolayers.
Lundt , N , Maryński , A , Cherotchenko , E , Pant , A , Fan , X , Tongay , S , Sęk , G , Kavokin , A V , Höfling , S & Schneider , C 2017 , ' Monolayered MoSe 2 : a candidate for room temperature polaritonics ' 2D Materials , vol 4 , no. 1 , 015006 . DOI: 10.1088/2053-1583/4/1/015006
© 2016, IOP Publishing. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at iopscience.iop.org / https://doi.org/10.1088/2053-1583/4/1/015006
We acknowledge financial support by the state of Bavaria. EC, AK and SH acknowledge the EPSRC Programme "Hybrid Polaritonics" (EP/M025330/1) for support. ST acknowledges support from NSF DMR-1552220. CS acknowledges support by the European Research Council within the project UnLiMIt-2D (grant number 679288).
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